Why are heating degree days (HDD) important?

Heating degree days (HDD) are crucial because they provide a quantitative measure that helps estimate the energy requirements for heating a building. Essentially, HDD is calculated based on the difference between the average outdoor temperature and a standard base temperature, typically 65°F. The greater the difference between the average outdoor temperature and this base temperature over a certain period, the higher the number of HDD. This calculation allows building professionals and energy managers to predict how much energy will be required to maintain a comfortable indoor temperature during colder months.

Understanding HDD is vital for effectively designing heating systems, budgeting energy costs, and assessing the potential impact of weather variations on heating energy consumption. This predictive capability directly supports energy efficiency improvements and helps in making informed decisions regarding building operations and energy use.